Cognitive radio network
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In this paper, new energy harvesting-based transmission schemes are proposed to improve the outage probability and throughput in underlay cognitive radio networks. In this system, a secondary source can harvest energy from a power beacon (PB) and/or a primary transmitter (PT) to transmit data to a secondary destination in the presence of a primary receiver.
7p vimelindagates 18-07-2022 8 4 Download
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In this study, we clarify fundamental features of the framework and clear out the relations between them. Then based primarily on the power allocation factors, we examine interference between cognitive sensors and primary sensors even as enhancing throughput of the network. Eventually, Matlab/Simulink based simulation is conducted to verify the analysis.
7p visteveballmer 06-11-2021 21 1 Download
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Bài viết nghiên cứu phương pháp bảo mật lớp vật lý (Physical-Layer Security) cho mạng vô tuyến nhận thức dạng nền (Underlay Cognitive Radio Network) sử dụng mã Fountain. Trong mô hình nghiên cứu, nguồn thứ cấp và nút chuyển tiếp thứ cấp hiệu chỉnh công suất phát để đảm bảo chất lượng dịch vụ của mạng sơ cấp không bị ảnh hưởng.
9p viaespa2711 31-07-2021 37 2 Download
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This work provides a comprehensive study on the concepts, advantages and challenges of the above-mentioned technologies. In addition, we also introduce four new research directions which are challenges of 5G and beyond.
15p cothumenhmong11 05-05-2021 29 4 Download
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This paper presents an implementation of NC under a two-way relay model and extends it to two non-straightforward scenarios: (i) multimedia transmission with layered coding and multiple-description coding, and (ii) cognitive radio with Vandermonde frequency division multiplexing (VFDM). The implementation is in real time and based on software-defined radio (SDR).
13p nguaconbaynhay11 07-04-2021 18 2 Download
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This paper investigates a cognitive radio network where a secondary sender assists a primary transmitter in relaying primary information to a primary receiver and also transmits its own information to a secondary recipient. This sender is capable of jamming to protect secondary and/or primary information against an eavesdropper and self-powering by harvesting radio frequency energy of primary signals. Security capability of both secondary and primary networks are analyzed in terms of secrecy outage probability.
27p nguathienthan9 08-12-2020 6 1 Download
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In a cognitive radio network (CRN), a preempted secondary user (SU) is placed in a call level queue to wait for accessing another free channel. If the availability of channels is transparent to SUs, packets will be generated during their waiting time and the performance of the CRN will be influenced by which way to handle these packets. In this paper, the call level queue is departed into two parts, delay queue and discard queue.
9p vivalletta2711 11-01-2020 14 1 Download
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n this paper, we study performances of multi-hop transmission protocols in underlay cognitive radio (CR) networks under impact of transceiver hardware impairment. In the considered protocols, cooperative communication is used to enhance reliability of data transmission at each hop on an established route between a secondary source and a secondary destination.
14p vixyliton2711 17-04-2019 33 1 Download
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Our objective is to enhance the secrecy performance of the secondary user (SU) in the presence of passive eavesdropper, whose channel state information (CSI) is unknown at the transmitter side. Two beamforming techniques are proposed; transmit beamforming (BF) and beamforming with jamming (BFJ). We investigate the impact of using artificial jamming (AJ) signal in improving the secrecy performance of the SU in underlay CRNs, where the AJ noise signal is used to confuse the eavesdropper’s channel.
6p byphasse043256 23-03-2019 21 0 Download
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In this article, a method for the detection of the spectrum with the purpose of detecting the presence of bands of unoccupied frequencies is proposed. The method used is the matched filter. The performance was assessed by using the MATLAB based on the AWGN channel.
5p byphasse043256 23-03-2019 33 0 Download
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It is observed that under the AWGN the detection probability for a given value of false alarm has been significantly achieved by optimal value of detection probability in the AND rule as the number of the user increases. Finally we have observed that due to fading condition, AND rule gives better performance in detection probability among three rules.
7p girlsseek 27-02-2019 22 1 Download
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A cognitive radio must detect the presence of primary user to avoid interference. Spectrum sensing helps to detect the spectrum holes (unutilized bands of the spectrum) providing high spectral resolution capability. Different spectrum sensing techniques for cognitive radio are discussed in this paper.
10p girlsseek 27-02-2019 17 0 Download
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This paper proposes an outage analysis framework for cooperative cognitive networks with proactive relay selection and selection combining (SC) under licensed outage constraint, maximum transmit power constraint, independent non-identical (i.n.i) fading distributions, erroneous channel information, and licensed users’ interference.
10p sansan2 26-05-2018 30 1 Download
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In the latest years much research effort was devoted to envision a new paradigm for wireless transmission. Results from recent works (Wireless Word Research Forum, 2005) indicate that a possible solution would lie in utilizing in a more efficient manner the diverse Radio Access Technologies1 (RATs) that are available nowadays, with the purpose of enabling interoperability among them and convergence into one global telecom infrastructure (beyond 3G).
156p namde01 11-04-2013 63 11 Download
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The wide proliferation of wireless communications unavoidably leads to the scarcity of frequency spectra. On one hand, wireless users become increasingly difficult to find available frequency bands for communications. On the other hand, many preallocated frequency bands are ironically under-utilized and thus the resources there are simply wasted. This situation leads to the introduction of cognitive radio, which was proposed in the last decade to address this dilemma.
310p orchid_1 25-09-2012 89 13 Download
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Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Editorial Advanced Signal Processing for Cognitive Radio Networks
2p dauphong15 18-02-2012 62 4 Download
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Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Securing Collaborative Spectrum Sensing against Untrustworthy Secondary Users in Cognitive Radio Networks
15p dauphong15 18-02-2012 47 3 Download
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Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Joint cooperative relay scheme for spectrum-efficient usage and capacity improvement in cognitive radio networks
29p sting07 16-02-2012 49 4 Download
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Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Performance Analysis of CSMA in an unslotted Cognitive Radio Network with Licensed Channels and unlicensed Channels
18p sting07 16-02-2012 54 6 Download
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Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Modeling the Lion Attack in Cognitive Radio Networks
10p dauphong14 13-02-2012 59 2 Download